Yep of course just speak even when you stutter go and give speech in school ceremonies even when you stutter constantly speak, 2 years ago I couldnt even say my name properly now man I am not gonna lie I have reduced around 98 percent to be fair like it's not noticable and I barely stutter now man like very rare, the thing is you need to constantly speak take deep breath everyday I am sure you will see changes but it completely depends upon you, I used to give speeches in school it would take me around 10 minutes to speak 100 words every one used to laugh but also I gave speech constantly giving speech made me fluent mate its 100 percent curable